JP6631423B2 - Biological information detecting device and chair provided with biological information detecting device - Google Patents

Description

  The present invention relates to a biological information detecting device and a chair including the biological information detecting device, and more particularly to a biological information detecting device that supports a living body and acquires biological information, and a chair including the biological information detecting device.

  2. Description of the Related Art Conventionally, a technique for supporting a living body and acquiring biological information such as a heart rate and a respiratory rate of the living body has been known. For example, Patent Literature 1 discloses a heartbeat respiration detection device for accurately detecting a heart rate and a respiration rate even when the entire body of the driver moves back and forth due to acceleration, deceleration, and the like. . This heartbeat respiration detection device irradiates a driver with an electromagnetic wave and receives a reflected wave thereof, and a calculation process of calculating a heart rate and a respiration rate based on a frequency change of the irradiation wave and the reflected wave. Device, and the transceiver is mounted on the surface of the seat belt on which the driver's body touches. Thus, even if the driver's body moves back and forth during driving, the heart rate and respiratory rate can be accurately detected because the transceiver is always kept in close contact with the driver.

  Further, Patent Document 2 discloses a biological signal detection device which aims to detect an accurate biological signal over a long period of time without any mechanical change of the components over time even when used for a long time. This biological signal detecting device includes a box having at least an upper plate, and a magnetic sensor disposed in the box, and the upper plate is made of a material having flexibility and soft magnetism. This document also discloses a rectangular fixed plate, a spacer member mounted on the fixed plate, a magnetic sensor provided in a hole formed in the spacer member, and a sheet-shaped mounted on the spacer member. And a soft magnetic member. The fixing plate is made of a non-magnetic material made of aluminum or a synthetic resin, and the spacer member is made of a non-magnetic material such as foamed polystyrene or urethane foam as a foaming agent. A hole for accommodating the magnetic sensor is formed substantially at the center of the spacer member. The magnetic sensor is shorter than the spacer member, and a gap is formed between the magnetic sensor and the soft magnetic member when the soft magnetic member is placed on the spacer member. The biological signal detection device is installed, for example, under a bed where the subject is recuperated, under a pillow, or on a toilet seat. Then, the distance between the magnetic sensor and the soft magnetic member changes due to the fine movement of the subject, and a fine movement signal corresponding to the change in the distance is output from the magnetic sensor.

  Patent Document 3 discloses a biological vibration frequency detection device with high detection accuracy. This biological vibration frequency detection device irradiates the subject with microwaves, performs a plurality of microwave transceivers that receive the reflected waves, and performs a cross-correlation process using a heartbeat signal based on the plurality of reflected waves, A CPU for detecting the heart rate of the subject using the processing result. Thus, the heart rate can be detected using the result of the cross-correlation processing. For this reason, even if one of the reflected waves contains noise, the influence of this noise can be reduced, and the heart rate detection accuracy can be improved.

  Further, Patent Literature 4 discloses a biological signal detection device that prevents deterioration of the accuracy of a biological signal of an occupant. This biological signal detecting device is a biological signal detecting device for detecting a biological signal of an occupant of an automobile, wherein the sensor unit detects the movement of the occupant by a radio wave type unmodulated Doppler sensor, and a phase change of an output of the sensor unit. A biological signal extraction unit that extracts a biological signal of an occupant based on the distance, a distance calculation unit that calculates an estimated distance between the sensor unit and the occupant based on an integrated value of a phase change amount of an output of the sensor unit, and an estimated distance. And a biological signal output determining unit that determines the reliability of the biological signal based on the information, and stops outputting the biological signal when the reliability is low. In this biological signal detection device, the sensor unit is installed behind the occupant such as a backrest of a seat on which the occupant sits, and the biological signal output determination unit is configured to output the biological signal when the estimated distance is equal to or greater than a predetermined distance threshold. Is determined to have low reliability, and the output of the biological signal is stopped.

  Patent Literature 5 discloses a biological information detecting device that appropriately arranges a biological detection sensor in relation to the configuration of an elastic member that supports a living body, and can reliably detect biological information. In this biological information detecting device, a long biological detection sensor is disposed on an elastic member supporting a living body, and the biological member is pressed against the biological detection device to detect biological information. The flexibility of the supporting portion is greater than the flexibility of the portion supporting both ends. For example, as the elastic member, the sheet base material used for the portion supporting the intermediate portion is a material that is more flexible than the sheet base material used for the portions supporting both end portions. Alternatively, the elastic member has a gap (recess or cutout) on the back surface side of the portion supporting the intermediate portion of the living body detection sensor. In this biological information detection device, when the occupant is seated on the seat cushion and the seat back is pressed, the concave portion and the notch portion of the elastic member are more easily bent than both end portions, so that the elastic member is bent together with the biometric detection sensor, and accompanying the occupant's breathing Then, pressure fluctuation (vibration) occurs in the piezoelectric body in the middle part of the living body detection sensor, and respective voltage signals generated by the piezoelectric effect are output.

  Further, Patent Document 6 discloses a vehicle seat provided with a sheet-like sensor for detecting an electric signal corresponding to a bioelectric potential of a seated person. The present invention discloses a vehicle seat capable of stably measuring. The seat back of the vehicle seat includes a sheet-like sensor capable of measuring a seated person's heart rate, a cushion pad is placed on a seat frame, and the seat back is covered with a trim cover. A strip-shaped conductive cloth having a width of about 20 mm is provided on the outer surface of the trim cover. The portion where the conductive cloth is provided has a three-layer structure of a conductive cloth, a skin, and wadding from the outside. The free end of the conductive cloth drawn into the seat back has a J-hook, and is hooked on the lower frame erection part, so that a part of the conductive cloth and the lower frame erection part come into contact with each other and can be energized. Has become.

JP 2001-260698 A JP-A-2002-0445350 JP 2009-055997 A JP 2010-120493 A JP-A-2014-087473 JP-A-2013-123359

  The present invention provides a living body information detecting device that supports a living body and accurately acquires biological information such as a heart rate and a respiratory rate of the living body, and a chair provided with the living body information detecting device.

In order to solve the above-mentioned problem, a biological information detecting device installed in a device having a body supporting portion for supporting a body and detecting biological information of a user of the device, wherein a part of the body supported by the body supporting portion A detecting unit having an irradiating unit for irradiating a radio wave toward the radio wave and a receiving unit for receiving a reflected wave of the radio wave radiated by the irradiating unit reflected from a part of the body; At the top of the side where the detection support unit supports the part of the body that radiates radio waves, the bottom where the detection unit is placed, the side where the detection support rises from the bottom to the surface that supports the part of the body, and A frame having an outwardly extending flange portion , wherein the detection support portion is disposed over the inside of the side portion, and the hardness of the detection support portion with respect to a part of the body is different from the body other than the detection support portion. The support is softer than the body part Body information detection apparatus is provided.
According to this, the hardness of the body support other than the detection support is relatively hard so that the distance between the surface of the living body and the detection unit is suppressed, and the hardness of the detection support is relatively soft and the By suppressing the pressure on the surface of the living body, it is possible to provide a living body information detecting device that supports the living body and that accurately obtains living body information such as the heart rate and respiration rate of the living body. Further, according to this, it is possible to accurately acquire biological information by keeping the distance between a part of the body and the detection unit constant.

Further, the detection support portion may be formed of an elastic member.
According to this, the biological information can be accurately acquired by absorbing the external vibration by the elastic member.

Further, in order to solve the above problems, and the biological information detection apparatus, a support for supporting the detection unit directly, and a seating surface including the body supporting portion, the lower surface of the bottom portion, the support A chair attached to the vehicle is provided.
According to this, it is possible to provide a chair that supports the living body and that accurately acquires biological information such as the heart rate and the respiratory rate of the living body.

  ADVANTAGE OF THE INVENTION According to this invention, the living body information detection apparatus which supports a living body and acquires accurately the biological information, such as a heart rate and a respiration rate of a living body, and a chair provided with the living body information detection apparatus can be provided.

1A is a schematic diagram in which a biological information detecting device according to a first embodiment of the present invention is installed on a vehicle seat, and FIG. 2B is an enlarged sectional view of the biological information detecting device disposed on a seat surface. 1A is a plan view and FIG. 2B is a cross-sectional view of a biological information detecting device according to a first embodiment of the present invention. FIG. 6A is a plan view and FIG. 6B is a cross-sectional view of the biological information detecting device according to the second embodiment of the present invention. The schematic diagram which installed the living body information detecting device of the second embodiment concerning the present invention in the seat of the vehicle.

<First embodiment>
With reference to FIGS. 1 and 2, a biological information detection device 100 according to the present embodiment will be described. The biological information detection device 100 is installed in a device CH having a body support portion BS that directly or indirectly supports a part of a human body BD, and detects biological information of a user of the device CH. Here, the device having the body supporting portion BS that supports a part of the human body BD (a generic name of a device, an instrument, and a machine) is, for example, a chair or a sofa on which a person sits, or a bed on which a person lies. And medical examination equipment installed in hospitals, and seats installed in vehicles and aircraft where people sit.

  The body supporting portion BS that supports a part of the human body BD refers to a seating surface or a backrest surface in a chair or the like, a mattress upper surface in a bed or the like. The body support portion BS may be such that a part of the human body BD contacts directly or indirectly, or a person may wear clothes to indirectly contact and support it. A part of the body BD is a buttocks or a thigh on a seating surface of a chair or the like, and is generally a back on a backrest or a bed of a chair or the like. In a physical examination device, any of human limbs may be used.

  In the present specification, the biological information of the user refers to the heart rate (pulse rate), the magnitude of the pulse wave, the respiratory rate and the magnitude of the respiration, and cough that causes movement of the skin and muscle not derived from these. Does not include sneezes.

  As shown in FIG. 1A, the biological information detecting device 100 according to the present embodiment is installed on a chair CH, which is a device mounted on a vehicle, a seat surface SF of a so-called seat CH and a backrest BK. . The surface of the seat surface SF and the surface of the backrest BK are covered with a skin, and the surface where a part of the body BD contacts the body support BS is the skin. In this case, the body support portion BS is an elastic member, that is, a so-called cushion disposed on the seat surface SF and the backrest portion BK, and supports a part of the weight of the body BD. A part of the body BD is, for example, a thigh or a back of a user of the seat CH who is a driver of the vehicle. The sheet CH includes a support SP, which is a strong frame or the like, inside, and the biological information detecting device 100 is attached to the support SP.

  As shown in FIGS. 1B and 2, the biological information detecting device 100 constitutes a detection unit 10 for detecting biological information and a part of a body supporting part BS, and a detection part for supporting a part of a body BD. It includes a support section 20 and a frame 30 on which the detection unit 10 is mounted. The detection unit 10 irradiates a radio wave (irradiation wave W1) to a part of the body BD supported by the body supporting unit BS, and the radio wave emitted by the irradiation unit 11 is reflected by a part of the body BD. And a receiving unit 12 that receives the reflected wave W2. The radio wave to be irradiated (irradiation wave W1) may be any radio wave having a frequency reflected on the skin surface of a living body, but is preferably a microwave. FIG. 1B is an enlarged cross-sectional view of the biological information detecting device 100 provided on the seat surface SF of the chair CH shown in FIG. 1A.

  The reflected wave W2 received by the receiving unit 12 performs processing for detecting biological information of normal heartbeat and respiration, and is transmitted to an external device or the like that uses the biological information. Since the skin surface of the living body is minutely moving due to heartbeat and breathing, the detection unit 10 detects the movement based on changes in the frequencies of the irradiation wave W1 and the reflected wave W2. Therefore, it is preferable not to apply a force such as compression to a part of the body BD for detecting biological information so as not to restrict the minute movement of the surface of the living body.

  The detection support unit 20 supports a part of the body BD similarly to the body support unit BS, and also supports a part of the body BD to which the irradiation unit 11 emits a radio wave. That is, the detection support unit 20 is a part that supports a part of the body BD for acquiring the biological information of the user of the sheet CH. The detection support unit 20 supports a part of the body BD that reflects the radio wave emitted by the irradiation unit 11 as a reflected wave W2. The hardness of the detection support 20 for a part of the body BD is softer than the hardness of the body support BS other than the detection support 20 for a part of the body BD.

  The hardness is a so-called hardness, and may be a hardness in a hardness test (JIS K6401) for a flexible polyurethane foam used for a chair or a mattress, for example. Hardness is given in Newtons, with lower values being softer than higher values. Therefore, the value of the hardness of the detection support 20 is smaller than the value of the hardness of the body support BS other than the detection support 20.

  Further, the hardness of a part of the body BD is indicated by the size of an arrow as shown in FIG. The hardness of the body support portion BS other than the detection support portion 20 is relatively hard, and supports a part of the body BD with a large force. On the other hand, the hardness of the detection support portion 20 is relatively soft, and supports a part of the body BD with a small force. In this way, by making the hardness of the body support portion BS other than the detection support portion 20 relatively hard, most of the weight of the body BD is supported at this portion, and thereby the distance between the surface of the living body and the detection unit 10 Fluctuation can be suppressed.

  In addition, by making the hardness of the detection support portion 20 relatively soft, pressure on the surface of the living body can be suppressed. As described above, the body support portion BS other than the detection support portion 20 suppresses the variation in the distance between the surface of the living body and the detection unit 10 and the detection support portion 20 suppresses the pressure on the surface of the living body, thereby supporting the living body. In addition, it is possible to provide the biological information detecting device 100 that accurately acquires biological information such as a heart rate and a respiratory rate of a living body.

  The hardness of a part of the body BD may be realized based on the hardness of the material itself, which is an elastic member used for the detection support unit 20, or may be realized based on a structure such as a size and a shape. Is also good. For example, an elastic member (for example, a flexible polyurethane foam) having the same hardness is used in the detection support portion 20 and the body support portion BS other than the detection support portion 20, but the thickness of the elastic member of the detection support portion 20 is reduced. Alternatively, by making the elastic member easily bendable by providing a notch or the like, the hardness of the detection support portion 20 with respect to a part of the body BD may be relatively softened. In addition, since the detection support part 20 is comprised from an elastic member, external vibration can be absorbed by an elastic member, and biological information can be acquired accurately.

  In addition, the frame 30 extends to the bottom 31 on which the detection unit 10 is disposed, the side 32 rising from the bottom 31 to the surface where the detection supporter 20 supports a part of the body BD, and extends outward at the upper end of the side 32. And a flange portion 33. The lower surface of the bottom 31 is attached to a strong support SP provided on the sheet CH, and the frame 30 itself is attached to the sheet CH. The bottom 31 has a rectangular shape in plan view, and the detection unit 10 is fixed and arranged on the upper surface of the rectangular bottom 31. Since the side portion 32 rises from the edge of the bottom portion 31 to the surface on which the detection support portion 20 supports a part of the body BD, the detection unit 10 is arranged so as to be housed in the frame 30 and supported. Indirectly supported by the body SP.

  The size of the bottom portion 31 and the height of the side portion 32 may have a relationship such that the bottom portion 31 directly hits a part of the body BD even when the radio wave emitted by the irradiation section 11 of the detection unit 10 spreads. The height of the side part 32 is provided at a height corresponding to the upper surface of the body support part BS, and the flange part 33 extends outward at the upper end of the side part 32 in a substantially similar shape to the bottom part 31, and It is configured to coincide with the upper surface.

  In this case, the detection support portion 20 is disposed over the entire surface inside the side portion 32 in a plan view and from the bottom portion 31 to the surface where the detection support portion 20 supports a part of the body BD. The frame 30 is preferably formed of a metal or resin that is harder than the body support BS and the detection support 20. By providing such a frame 30, the distance between a part of the body BD and the detection unit 10 is kept constant, thereby reducing the effects of heartbeats such as vibrations of a vehicle or displacements of the living body surface other than the respiration other than the respiration. Alternatively, biological information such as breathing can be accurately detected.

<Second embodiment>
With reference to FIG. 3, a biological information detecting device 100A according to the present embodiment will be described. To avoid repetition, the same reference numerals are given to the same parts as in the above embodiment, and different parts will be mainly described. The biological information detection device 100A includes a detection unit 10 that detects biological information, and a detection support part 20A that forms a part of the body support part BS and supports a part of the body BD. The biological information detecting device 100A does not have the frame 30 existing in the above embodiment.

  The body support part BS is composed of two layers, and a lower layer near the support SP in the two layers is provided with a hole for accommodating the detection unit 10, and an upper layer in contact with a part of the body BD in the two layers is provided in the upper layer. And a hole for receiving the body support portion BS. The detection unit 10 is directly attached to the support SP, and is disposed in a hole provided below the body support BS. The detection support portion 20A formed with substantially the same thickness as the upper layer of the body support portion BS is arranged in a hole provided in the upper layer of the body support portion BS, and is configured to coincide with the body support portion BS on the seat surface SF. Is done.

  The plan view size of the hole provided in the upper layer in contact with a part of the body BD is larger than the plan view size of the hole provided in the lower layer near the support SP. The size in plan view of the hole provided in the upper layer in contact with a part of the body BD and the thickness of the upper layer are such that even if the radio wave irradiated by the irradiation unit 11 of the detection unit 10 spreads, it directly hits a part of the body BD. It is only necessary to have

  The hardness of the body support portion BS other than the detection support portion 20A is relatively hard, and supports a part of the body BD with a large force. On the other hand, the hardness of the detection support portion 20A is relatively soft, and supports a part of the body BD with a small force. In this way, by making the hardness of the body support portion BS other than the detection support portion 20A relatively high, most of the weight of the body BD is supported at this portion, and thereby, the distance between the surface of the living body and the detection unit 10 Fluctuation can be suppressed. In addition, by making the hardness of the detection support portion 20A relatively soft, pressure on the surface of the living body can be suppressed. In this way, the body support portion BS other than the detection support portion 20A suppresses the variation in the distance between the surface of the living body and the detection unit 10 and the detection support portion 20A suppresses the pressure on the surface of the living body, thereby supporting the living body. In addition, it is possible to provide a biological information detecting device 100A that accurately acquires biological information such as a heart rate and a respiratory rate of a living body.

  As shown in FIG. 4, the biological information detecting device 100A can be arranged at various places on the sheet CH. When acquiring the pulsation, it is preferable that the biological information detecting device 100A is disposed above the backrest BK close to the heart. In addition, when acquiring biological information that is not affected by the operation of the steering wheel, it is preferable that the biological information detecting device 100A be arranged along the spine axis, particularly around the waist. In addition, when acquiring biological information that is less affected by upper body movement such as breathing, the biological information detecting device 100A is preferably disposed on a seat surface SF near the thigh. As described above, by incorporating the biological information detecting device 100A in the body support portion BS of the sheet CH, the influence of the sheet component can be avoided, and the biological information detecting device 100A can be easily arranged in a place where biological information can be easily obtained. The seat CH (chair CH) provided with the living body information detecting device 100A supports the living body and can accurately acquire biological information such as the heart rate and respiratory rate of the living body.

  It should be noted that the present invention is not limited to the illustrated embodiment, and can be implemented with a configuration that does not deviate from the contents described in the claims. That is, the present invention has been particularly shown and described with particular reference to particular embodiments, but without departing from the spirit and purpose of the invention, Those skilled in the art can make various modifications in other detailed configurations.

REFERENCE SIGNS LIST 100 biological information detecting device 10 detecting unit 11 irradiating unit 12 receiving unit 20 detecting supporting unit 30 frame 31 bottom 32 side 33 flange CH device (chair, seat)
SF Seat BK Backrest BS Body support SP Support BD Body W1 Irradiation wave W2 Reflection wave

Claims (3)

A biological information detection device that is installed in a device having a body support unit that supports a body and detects biological information of a user of the device,
A detection unit having an irradiation unit that emits a radio wave toward a part of the body supported by the body support unit and a reception unit that receives a reflected wave of the radio wave emitted by the irradiation unit reflected by the part of the body When,
A detection support unit that constitutes a part of the body support unit and supports the part of the body where the irradiation unit irradiates radio waves,
A frame having a bottom portion on which the detection unit is arranged, a side portion rising from the bottom portion to a surface where the detection support portion supports a part of the body, and a flange portion extending outward at an upper end of the side portion. ,
With
The detection support portion is disposed over the inside of the side portion,
The hardness of the detection support for the part of the body is softer than the hardness of the body support other than the detection support for the part of the body,
Biological information detection device.   The living body information detecting device according to claim 1, wherein the detection support portion is formed of an elastic member. The biological information detecting device according to claim 1 or 2 ,
A support for supporting the sensing unit directly,
A seat surface including the body support,
Equipped with a,
A chair having a bottom surface attached to the support .